1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2011 Nathan Whitehorn
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/malloc.h>
35 #include <sys/bus.h>
36 #include <sys/cpu.h>
37 #include <machine/bus.h>
38 #include <machine/intr_machdep.h>
39
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/ofw_bus_subr.h>
43
44 #include <powerpc/pseries/plpar_iommu.h>
45
46 #include "iommu_if.h"
47
48 static int vdevice_probe(device_t);
49 static int vdevice_attach(device_t);
50 static const struct ofw_bus_devinfo *vdevice_get_devinfo(device_t dev,
51 device_t child);
52 static int vdevice_print_child(device_t dev, device_t child);
53 static struct resource_list *vdevice_get_resource_list(device_t, device_t);
54 static bus_dma_tag_t vdevice_get_dma_tag(device_t dev, device_t child);
55
56 /*
57 * VDevice devinfo
58 */
59 struct vdevice_devinfo {
60 struct ofw_bus_devinfo mdi_obdinfo;
61 struct resource_list mdi_resources;
62 bus_dma_tag_t mdi_dma_tag;
63 };
64
65 static device_method_t vdevice_methods[] = {
66 /* Device interface */
67 DEVMETHOD(device_probe, vdevice_probe),
68 DEVMETHOD(device_attach, vdevice_attach),
69
70 /* Bus interface */
71 DEVMETHOD(bus_add_child, bus_generic_add_child),
72 DEVMETHOD(bus_child_pnpinfo, ofw_bus_gen_child_pnpinfo),
73 DEVMETHOD(bus_print_child, vdevice_print_child),
74 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
75 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
76 DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
77 DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
78 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
79 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
80 DEVMETHOD(bus_get_resource_list, vdevice_get_resource_list),
81
82 /* ofw_bus interface */
83 DEVMETHOD(ofw_bus_get_devinfo, vdevice_get_devinfo),
84 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
85 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
86 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
87 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
88 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
89
90 /* IOMMU interface */
91 DEVMETHOD(bus_get_dma_tag, vdevice_get_dma_tag),
92 DEVMETHOD(iommu_map, phyp_iommu_map),
93 DEVMETHOD(iommu_unmap, phyp_iommu_unmap),
94
95 DEVMETHOD_END
96 };
97
98 static driver_t vdevice_driver = {
99 "vdevice",
100 vdevice_methods,
101 0
102 };
103
104 DRIVER_MODULE(vdevice, ofwbus, vdevice_driver, 0, 0);
105
106 static int
vdevice_probe(device_t dev)107 vdevice_probe(device_t dev)
108 {
109 const char *name;
110
111 name = ofw_bus_get_name(dev);
112
113 if (name == NULL || strcmp(name, "vdevice") != 0)
114 return (ENXIO);
115
116 if (!ofw_bus_is_compatible(dev, "IBM,vdevice"))
117 return (ENXIO);
118
119 device_set_desc(dev, "POWER Hypervisor Virtual Device Root");
120
121 return (0);
122 }
123
124 static int
vdevice_attach(device_t dev)125 vdevice_attach(device_t dev)
126 {
127 phandle_t root, child;
128 device_t cdev;
129 struct vdevice_devinfo *dinfo;
130
131 root = ofw_bus_get_node(dev);
132
133 /* The XICP (root PIC) will handle all our interrupts */
134 powerpc_register_pic(root_pic, OF_xref_from_node(root),
135 1 << 24 /* 24-bit XIRR field */, 1 /* Number of IPIs */, FALSE);
136
137 for (child = OF_child(root); child != 0; child = OF_peer(child)) {
138 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
139
140 if (ofw_bus_gen_setup_devinfo(&dinfo->mdi_obdinfo,
141 child) != 0) {
142 free(dinfo, M_DEVBUF);
143 continue;
144 }
145 resource_list_init(&dinfo->mdi_resources);
146
147 ofw_bus_intr_to_rl(dev, child, &dinfo->mdi_resources, NULL);
148
149 cdev = device_add_child(dev, NULL, -1);
150 if (cdev == NULL) {
151 device_printf(dev, "<%s>: device_add_child failed\n",
152 dinfo->mdi_obdinfo.obd_name);
153 ofw_bus_gen_destroy_devinfo(&dinfo->mdi_obdinfo);
154 free(dinfo, M_DEVBUF);
155 continue;
156 }
157 device_set_ivars(cdev, dinfo);
158 }
159
160 return (bus_generic_attach(dev));
161 }
162
163 static const struct ofw_bus_devinfo *
vdevice_get_devinfo(device_t dev,device_t child)164 vdevice_get_devinfo(device_t dev, device_t child)
165 {
166 return (device_get_ivars(child));
167 }
168
169 static int
vdevice_print_child(device_t dev,device_t child)170 vdevice_print_child(device_t dev, device_t child)
171 {
172 struct vdevice_devinfo *dinfo;
173 struct resource_list *rl;
174 int retval = 0;
175
176 dinfo = device_get_ivars(child);
177 rl = &dinfo->mdi_resources;
178
179 retval += bus_print_child_header(dev, child);
180
181 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
182
183 retval += bus_print_child_footer(dev, child);
184
185 return (retval);
186 }
187
188 static struct resource_list *
vdevice_get_resource_list(device_t dev,device_t child)189 vdevice_get_resource_list (device_t dev, device_t child)
190 {
191 struct vdevice_devinfo *dinfo;
192
193 dinfo = device_get_ivars(child);
194 return (&dinfo->mdi_resources);
195 }
196
197 static bus_dma_tag_t
vdevice_get_dma_tag(device_t dev,device_t child)198 vdevice_get_dma_tag(device_t dev, device_t child)
199 {
200 struct vdevice_devinfo *dinfo;
201 while (child != NULL && device_get_parent(child) != dev)
202 child = device_get_parent(child);
203 dinfo = device_get_ivars(child);
204
205 if (dinfo->mdi_dma_tag == NULL) {
206 bus_dma_tag_create(bus_get_dma_tag(dev),
207 1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
208 NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED,
209 BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->mdi_dma_tag);
210 phyp_iommu_set_dma_tag(dev, child, dinfo->mdi_dma_tag);
211 }
212
213 return (dinfo->mdi_dma_tag);
214 }
215